I phone xr not turning on. Any suggestion would be highly appreciated

gokul ~ The battery is unlikely to be in good condition after being stored for four years. Have the iPhone inspected by a qualified technician:

Find Locations - Apple

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gokul ~ Won't charge and still the original battery? ...If so, have the battery replaced:

iPhone Battery & Power Repair

About genuine iPhone batteries

Repair Provider Verification

(Articles found by searching Apple's Knowledge Base.)

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The battery is long gone. Take the phone to an Apple Store or authorized Apple Service shop.